A mobile communication terminal including a first rotary key configured to generate a first signal when the first rotary key is rotated, in which the first signal indicates a direction and an amount the first rotary key is rotated, a second rotary key configured to generate a second signal when the second rotary key is rotated, in which the second signal indicates a direction and an amount the first rotary key is rotated, a display unit configured to display a screen thereon, and a controller configured to control a specific operation on the displayed screen based on the first and second signals.